Transformer.



PATENTED AUG. 28, 1906.

W. A. HALL. TRANSFORMER.

APPLIOATION FILED MAY 12,1904."

,v M RM M N 0+ T J r Er Va mt a M WITNESSESI ing-is a specification.

. ings are placed over each of the two legs of termed uniplanar.

PATENT onriony ELECTRIC COMPANY, A 'QORPORATION oF NEW YORK.

' TRANSFORMER.

To all ug/mm'it may concern:

Be it known'that I, WALTER A. HALL, a citizen of theUnited States, residing at L county of Essex, State of Massachusetts, ave invented certain new'and useful Improve-' ments in Transformers, of which the follo My present invention relates to impr'yo e? ments in alternating current apparatiniy such as reactance-coils, transformers, or the like-and comprises an advantageous arrangement of the ,.,coils whereby the same may be well ventilated. The construction which I employ permits me also to reduce the amount of iron in the core.

. Briefly characterized, the invention comprises an eccentric mounting of the coils with respect to each other, whereby there is a greater space between adjacent coils-at one side of the leg of the core than at the other side of said leg. I

The features of novelt characteristic of my invention are pointe out with particularity in the appended claims. The invention itself, however, will be better understood by reference to the following description, taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of a transformer embod ing my invention. Fig. 2' is a plan view of the same, and'Fig. 3 is' a plan view of a modification. f

y The transformer shown in Fig. 1 as illustrative of my invention is of the so-called core type. It has a rectangular core with two upright legs 1 and 2 of cruciform crosssection, as shown in Fig. 2, connected at top and bottom by members 3 and 4. The core is'ofcourse laminated, as usual in this type of apparatus. High and low potential windthe core. I The windings on each leg are subdivided, so as toform four coils, as at 5, 6, 7, and S. The coils may be of any desired depth, measured axially, either thin or thick, and beingflat in lateral extension may be The inner and outer coils 5 and 8 form one winding, in this case the low-potential one, while the two in'ner coils 6 and 7 constitute the high-potential winding. The inner coil 5 is octagonal in cross-section and closely surrounds the eore 2, as indicated. The inner half 6 of the high-potential winding is circu- Sp'ecification of Letters Patent. Application filed May 12.1904 strain. 207.684.

2 son I iaten ted 28, 190 6.

corners of the inner coil 5 and at other;

points ventilating-spaces, asat 9, 10, &c'.,

are formed. The outer half 7 of the high-po- 'tential winding and the outer half 8 of the low-potential winding are fitted one within the other, as shown, and surround'the two innercoils 5 and 6. Instead, however, of being WAL ER 'A.' HALL, or LYNN; MASSACHUSETTS, Assienon TO GENERAL;

located concentrically, as heretofore, the two outer coils are arranged so that a wider ventilating-space is formed at one side of the core than at the other. I11 the arrangement shown theflfltwo sets of coils practically come to *gether wherc they pass through the opening Ofthcore, as at .11. Outside 9f the core,

r 7,. .ih the C i fqq widely separated, and r "thus form anfefficient"ventilating-space 12,5;- the Width f hich' gradually decreases as the? inside of thecore is a proached. The ar-EQ',

rangement of the coils t us described affords very efficient ventilation and at the same time by minimizing ventilating-s aces in those portions of the windings insi e of the core permits the to and bottom connecting members 3 and 4 o the core to be shortened.

Thus the Weight of the core may-be appreci-' ably reduced and at the same time good'ventilation of the coils as a whole secured. Instead of making the coils, with the exception of the innermost ones, circular in crosssection I may make portions thereof Where they pass through the opening of the core somewhat flattened, as indicated at 13, 14, and 15 in Fig. 3. In this case practically the same advantages aresecured as above. mentioned, but, to a reater extent.

It will be evi cut to one skilled in the art that numerous changes may be made in the embodiments of my invention without departin from the spirit thereof, for which rea- 0 not .Wish to be limited to the exact details'shown and described. I

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a transformer, the combination with a hollow rectangular iron core, of a plurality of uniplanar, prima and secondary coils on a leg of said core, ad acent coils being in contact with one another on one side of said leg single magnetic circuit, of a plurality ol" uni,- planar, primary and secondary coils on a leg of said core, adjacent (:oils being in contact with one another on one of said leg and having an intervening space on another side of said leg, substantially as described.

3. In a transformer the combination with a hollow rectangular iron core, of aplurality oi" uniplanar, primary and secondary coils on a leg oi said core, there being a greater space between adjacent (oils at one side of said leg than at the other side of said leg.

4. In a transl'ormer, the combination with a hollow rectangular iron core providing a single magnetic circuit, of a plurality of uniplanar, primary and secondary coils, on a leg of said core, there being a greater space between adjacent coils at one side of said ieg than at another side of said leg.

5. In a core type trans'hnfiner, the eonibination of a core, and coils on a leg of said core mounted eecentrically with respect to each other.

6. in a trz'ms'former, the combination. of a core, and coils on said core one inside of another, and arranged eccentrically with respect to each other.

' 7. In a transformer, the combination of a core, and a coil or coils mounted eecei'itrically on said core.

8. In a transformer, a core-leg, and a plurality of coils mounted thereon and unsymnietrically placed with respect to each other.

9. in a transformer, a core-leg, and a pair of similarly-shaped coils surrounding said core-leg said coils being unsymmetrically placed with. reference to each other whereby ventilating-passages are formed between portions of the coils. v

In. witness whereof I have hereunto set my hand this lUth day of Way, 1904.

'A l i'l ltli A. l [ALI l. 

